Datasheet SN74AHC123ADBR, SN74AHC123ADGVR, SN74AHC123AN, SN74AHC123APWR, SNJ54AHC123AFK Datasheet (Texas Instruments)
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
D
EPIC
(Enhanced-Performance Implanted
CMOS) Process
D
Operating Range 2-V to 5.5-V V
D
Schmitt-Trigger Circuitry On A, B, and CLR
CC
Inputs for Slow Input Transition Rates
D
Edge Triggered From Active-High or
Active-Low Gated Logic Inputs
D
Retriggerable for Very Long Output Pulses
D
Overriding Clear Terminates Output Pulse
D
Glitch-Free Power-Up Reset On Outputs
D
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
D
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
D
Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), Thin Very Small-Outline (DGV), Thin
Shrink Small-Outline (PW), and Ceramic
Flat (W) Packages, Ceramic Chip Carriers
(FK), and Standard Plastic (N) and Ceramic
(J) DIPs
SN54AHC123A ...J OR W PACKAGE
SN74AHC123A . . . D, DB, DGV, N, OR PW PACKAGE
1CLR
2R
ext/Cext
SN54AHC123A . . . FK PACKAGE
1CLR
1Q
NC
2Q
2C
ext
(TOP VIEW)
1A
1B
1Q
2Q
2C
ext
GND
1B1ANC
3212019
4
5
6
7
8
910111213
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
(TOP VIEW)
CC
V
V
CC
1R
ext/Cext
1C
ext
1Q
2Q
2CLR
2B
2A
ext
/C
ext
1R
18
17
16
15
14
1C
ext
1Q
NC
2Q
2CLR
description
NC
2A
2B
ext
/C
The ’AHC123A devices are dual retriggerable
monostable multivibrators designed for 2-V to
5.5-V VCC operation.
These edge-triggered multivibrators feature
NC – No internal connection
GND
ext
2R
output pulse-duration control by three methods. In
the first method, the A input is low, and the B input goes high. In the second method, the B input is high, and
the A input goes low. In the third method, the A input is low, the B input is high, and the clear (CLR) input goes
high.
The output pulse duration is programmed by selecting external resistance and capacitance values. The external
timing capacitor must be connected between C
between R
R
ext/Cext
ext/Cext
and VCC. The output pulse duration also can be reduced by taking CLR low.
and VCC. T o obtain variable pulse durations, connect an external variable resistance between
ext
and R
ext/Cext
(positive) and an external resistor connected
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input
pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition
rates with jitter-free triggering at the outputs.
Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or
high-level-active (B) input. Pulse duration can be reduced by taking CLR low. CLR input can be used to override
A or B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early
clearing.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 2000, T exas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
1
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
description (continued)
The variance in output pulse duration from device to device typically is less than ±0.5% for given external timing
components. An example of this distribution for the ’AHC123A is shown in Figure 10. V ariations in output pulse
duration versus supply voltage and temperature are shown in Figure 6.
During power up, Q outputs are in the high state, and Q outputs are in the low state. The outputs are glitch free
without applying a reset pulse.
The SN54AHC123A is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74AHC123A is characterized for operation from –40°C to 85°C.
For additional application information on multivibrators, see the application report
SN74AHC123A and SN74AHCT123A
logic symbol
‡
1CLR
1C
1R
ext/Cext
2CLR
2C
2R
ext/Cext
1A
1B
ext
2A
2B
ext
, literature number SCLA014.
FUNCTION TABLE
(each multivibrator)
INPUTS
CLR
†
These outputs are based on the
assumption that the indicated steady-state
conditions at the A and B inputs have been
set up long enough to complete any pulse
started before the setup.
1
2
3
14
15
9
10
11
6
7
A B Q Q
L X X L H
X HXL†H
X XLL†H
H L ↑
H
#
↑ L H
&
R
CX
RX/CX
&
R
CX
RX/CX
OUTPUTS
H
†
†
13
1Q
4
1Q
5
2Q
12
2Q
Designing With The
‡
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, DB, DGV, J, N, PW, and W packages.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
logic diagram, each multivibrator (positive logic)
A
SN54AHC123A, SN74AHC123A
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
R
ext/Cext
C
ext
CLR
input/output timing diagram
A
B
CLR
R
ext/Cext
Q
B
R
Q
Q
t
rr
Q
t
w
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
t
w
tw + t
rr
3
SN54AHC123A, SN74AHC123A
UNIT
mA
mA
R
External timing resistance
Ω
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage range, V
Input voltage range, V
Output voltage range in high or low state, V
(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 2) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
(see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . .
O
†
Output voltage range in power-off state, VO (see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
Output clamp current, I
Continuous output current, I
Continuous current through V
(V
< 0) –20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
I
(V
< 0 or VO > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OK
O
(V
= 0 to VCC) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
O
or GND ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
Package thermal impedance, θJA (see Note 3): D package 73°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DB package 82°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DGV package 120°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 108°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Voltage values are with respect to the network ground terminal.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
3. The package thermal impedance is calculated in accordance with JESD 51.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions (see Note 4)
SN54AHC123A SN74AHC123A
MIN MAX MIN MAX
V
CC
V
IH
V
IL
V
I
V
O
I
OH
I
OL
ext
∆t/∆V
T
A
NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Supply voltage 2 5.5 2 5.5 V
VCC = 2 V 1.5 1.5
High-level input voltage
Low-level input voltage
Input voltage 0 5.5 0 5.5 V
Output voltage 0 V
High-level output current
Low-level output current
Power-up ramp rate 1 1 ms/V
CC
Operating free-air temperature –55 125 –40 85 °C
Implications of Slow or Floating CMOS Inputs
, literature number SCBA004.
VCC = 3 V
VCC = 5.5 V 3.85 3.85
VCC = 2 V 0.5 0.5
VCC = 3 V
VCC = 5.5 V 1.65 1.65
VCC = 2 V –50 –50
VCC = 3.3 V ± 0.3 V
VCC = 5 V ± 0.5 V –8 –8
VCC = 2 V 50 50
VCC = 3.3 V ± 0.3 V
VCC = 5 V ± 0.5 V 8 8
VCC = 2 V 5k 5k
VCC > 3 V 1k 1k
2.1 2.1
0.9 0.9
CC
–4 –4
4 4
0 V
CC
V
V
V
m
A
m
A
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER
TEST CONDITIONS
V
UNIT
I
A
(er circuit)
R
t
/C
t
V
CC
TEST CONDITIONS
UNIT
t
ns
t
Pul
TEST CONDITIONS
UNIT
t
ns
t
Pul
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
CC
2 V 1.9 2 1.9 1.9
IOH = –50 mA
V
OH
IOH = –4 mA 3 V 2.58 2.48 2.48
IOH = –8 mA 4.5 V 3.94 3.8 3.8
IOL = 50 mA
V
OL
IOL = 4 mA 3 V 0.36 0.5 0.44
IOL = 8 mA 4.5 V 0.36 0.5 0.44
R
ext/Cext
I
A, B, and CLR
I
Quiescent VI = VCC or GND, IO = 0 5.5 V 4 40 40
CC
Active statepVI = VCC or GND,
I
CC
C
i
* On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.
†
This test is performed with the terminal in the off-state condition.
VI = VCC or GND 5.5 V ±0.25 ±2.5 ±2.5
†
VI = VCC or GND 0 V to 5.5 V ±0.1 ±1* ±1
= 0.5
ex
ex
VI = VCC or GND 5 V 1.9 10 10 pF
3 V 2.9 3 2.9 2.9
4.5 V 4.4 4.5 4.4 4.4
2 V 0.1 0.1 0.1
3 V 0.1 0.1 0.1
4.5 V 0.1 0.1 0.1
3 V 160 250 280 280
4.5 V 280 500 650 650
5.5 V 360 750 975 975
TA = 25°C SN54AHC123A SN74AHC123A
MIN TYP MAX MIN MAX MIN MAX
V
V
m
m
A
m
A
timing requirements over recommended operating free-air temperature range, VCC = 3.3 V ± 0.3 V
(unless otherwise noted) (see Figure 1)
TA = 25°C SN54AHC123A SN74AHC123A
MIN TYP MAX MIN MAX MIN MAX
Pulse
w
duration
rr
‡
See retriggering data in the
se retrigger time
CLR 5 5 5
or B trigger 5 5 5
A
R
= 1 kΩ, C
ext
R
= 1 kΩ, C
ext
application information
= 100 pF
ext
= 0.01 mF
ext
section.
‡
76
‡
1.8
‡ ‡
‡ ‡
ns
m
s
timing requirements over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V
(unless otherwise noted) (see Figure 1)
TA = 25°C SN54AHC123A SN74AHC123A
MIN TYP MAX MIN MAX MIN MAX
Pulse
w
duration
rr
‡
See retriggering data in the
se retrigger time
CLR 5 5 5
or B trigger 5 5 5
A
R
= 1 kΩ, C
ext
R
= 1 kΩ, C
ext
application information
= 100 pF
ext
= 0.01 mF
ext
section.
‡
59
‡
1.5
‡ ‡
‡ ‡
ns
m
s
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54AHC123A, SN74AHC123A
PARAMETER
UNIT
A
B
Q
Q
C
15 pF
ns
CLR
Q
Q
C
15 pF
ns
CLR
Q
Q
C
pF
ns
A
B
Q
Q
C
50 pF
ns
CLR
Q
Q
C
50 pF
ns
CLR
Q
Q
C
pF
ns
†
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
switching characteristics over recommended operating free-air temperature range,
V
= 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
CC
FROM TO TEST
(INPUT) (OUTPUT) CONDITIONS
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
w
‡
∆t
w
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
†
tw = Pulse duration at Q and Q
‡
∆tw = Output pulse-duration variation (Q and Q
or
trigger
or
trigger
outputs
or
or
or
or
or
or
Q or Q
CL = 50 pF,
C
R
CL = 50 pF,
C
ext
R
CL = 50 pF,
C
R
) between circuits in same package
=
L
=
L
= 15
L
=
L
=
L
= 50
L
= 28 pF,
ext
= 2 kΩ
ext
= 0.01 µF,
= 10 kΩ
ext
= 0.1 µF,
ext
= 10 kΩ
ext
p
p
p
p
p
p
TA = 25°C SN54AHC123A SN74AHC123A
MIN TYP MAX MIN MAX MIN MAX
9.5* 20.6* 1* 24* 1 24
10.2* 20.6* 1* 24* 1 24
7.5* 15.8* 1* 18.5* 1 18.5
9.3* 15.8* 1* 18.5* 1 18.5
10* 22.4* 1* 26* 1 26
10.6* 22.4* 1* 26* 1 26
10.5 24.1 1 27.5 1 27.5
11.8 24.1 1 27.5 1 27.5
8.9 19.3 1 22 1 22
10.5 19.3 1 22 1 22
11 25.9 1 29.5 1 29.5
12.3 25.9 1 29.5 1 29.5
182 240 300 300 ns
90 100 110 90 110 90 110
0.9 1 1.1 0.9 1.1 0.9 1.1 ms
±1 %
m
s
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER
UNIT
A
B
Q
Q
C
15 pF
ns
CLR
Q
Q
C
15 pF
ns
CLR
Q
Q
C
pF
ns
A
B
Q
Q
C
50 pF
ns
CLR
Q
Q
C
50 pF
ns
CLR
Q
Q
C
pF
ns
†
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
switching characteristics over recommended operating free-air temperature range,
V
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
CC
FROM TO TEST
(NPUT) (OUTPUT) CONDITIONS
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
w
‡
∆t
w
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
†
tw = Pulse duration at Q and Q
‡
∆tw = Output pulse-duration variation (Q and Q
or
trigger
or
trigger
outputs
or
or
or
or
or
or
Q or Q
CL = 50 pF,
C
R
CL = 50 pF,
C
ext
R
CL = 50 pF,
C
R
) between circuits in same package
=
L
=
L
= 15
L
=
L
=
L
= 50
L
= 28 pF,
ext
= 2 kΩ
ext
= 0.01 µF,
= 10 kΩ
ext
= 0.1 µF,
ext
= 10 kΩ
ext
p
p
p
p
p
p
TA = 25°C SN54AHC123A SN74AHC123A
MIN TYP MAX MIN MAX MIN MAX
6.5* 12* 1* 14* 1 14
7.1* 12* 1* 14* 1 14
5.3* 9.4* 1* 11* 1 11
6.5* 9.4* 1* 11* 1 11
6.9* 12.9* 1* 15* 1 15
7.4* 12.9* 1* 15* 1 15
7.3 14 1 16 1 16
8.3 14 1 16 1 16
6.3 11.4 1 13 1 13
7.4 11.4 1 13 1 13
7.6 14.9 1 17 1 17
8.7 14.9 1 17 1 17
167 200 240 240 ns
90 100 110 90 110 90 110
0.9 1 1.1 0.9 1.1 0.9 1.1 ms
±1 %
m
s
operating characteristics, V
C
Power dissipation capacitance No load 29 pF
pd
= 5 V, T
CC
PARAMETER TEST CONDITIONS TYP UNIT
= 25°C
A
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
7
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
(see Note A)
LOAD CIRCUIT
Input A
(see Note B)
Input B
(see Note B)
t
PLH
In-Phase
Output
t
PHL
Out-of-Phase
Output
NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: ZO = 50 Ω, tr +3 ns, tf + 3 ns.
C. The outputs are measured one at a time with one input transition per measurement.
50% V
50% V
VOLTAGE WAVEFORMS
DELA Y TIMES
C
L
CC
CC
50% V
50% V
Test
Point
CC
CC
V
0 V
V
0 V
V
V
V
V
CC
CC
OH
OL
OH
OL
Inputs or
Outputs
Input CLR
(see Note B)
In-Phase
Output
Out-of-Phase
Output
t
w
50% V
CC
VOLTAGE WAVEFORMS
PULSE DURATION
50% V
CC
t
PLH
50% V
t
PHL
50% V
VOLTAGE WAVEFORMS
DELA Y TIMES
CC
CC
50% V
50% V
CC
t
PHL
50% V
t
PLH
50% V
CC
V
0 V
V
CC
V
V
CC
V
V
0 V
CC
OH
OL
OH
OL
CC
Figure 1. Load Circuit and Voltage Waveforms
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
APPLICATION INFORMATION
caution in use
To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep
the wiring between the external components and C
power-down considerations
ext
and R
ext/Cext
terminals as short as possible.
Large values of C
can cause problems when powering down the ’AHC123A because of the amount of energy
ext
stored in the capacitor. When a system containing this device is powered down, the capacitor can discharge
from VCC through the protection diodes at pin 2 or pin 14. Current through the input protection diodes must be
limited to 30 mA; therefore, the turn-off time of the V
t = V
CC
× C
/30 mA. For example, if VCC = 5 V and C
ext
ext
power supply must not be faster than
CC
= 15 pF , the VCC supply must turn off no faster than
t = (5 V) × (15 pF)/30 mA = 2.5 ms. Usually , this is not a problem because power supplies are heavily filtered
and cannot discharge at this rate. When a more rapid decrease of VCC to zero occurs, the ’AHC123A can sustain
damage. To avoid this possibility, use external clamping diodes.
output pulse duration
The output pulse duration, tw, is determined primarily by the values of the external capacitance (CT) and timing
resistance (R
). The timing components are connected as shown in Figure 2.
T
V
CC
R
T
C
T
To R
Terminal
ext/Cext
To C
ext
Terminal
Figure 2. Timing-Component Connections
The pulse duration is given by:
+K
t
w
RT
C
T
(1)
if CT is ≥1000 pF, K = 1.0 or
if CT is <1000 pF, K can be determined from Figure 5
where:
tw= pulse duration in ns
RT= external timing resistance in kΩ
CT= external capacitance in pF
K = multiplier factor
Equation 1 and Figure 3 can be used to determine values for pulse duration, external resistance, and external
capacitance.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
9
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
APPLICATION INFORMATION
retriggering data
The minimum input retriggering time (t
the input. After t
, the device retriggers the output. Experimentally , it also can be shown that to retrigger the
MIR
output pulse, the two adjacent input signals should be t
duration is calculated as shown in Figure 3.
t
MIR
) is the minimum time required after the initial signal before retriggering
MIR
apart, where t
MIR
= 0.30 × tw. The retrigger pulse
MIR
Input
Output
t
PLH
t
RT
t
w
tRT = tw + t
Where:
t
= Minimum Input Retriggering Time
MIR
t
= Propagation Delay
PLH
tRT= Retrigger Time
tw= Output Pulse Duration Before Retriggering
= (K × RT × CT) + t
PLH
PLH
Figure 3. Retrigger Pulse Duration
The minimum value from the end of the input pulse to the beginning of the retriggered output should be
approximately 15 ns to ensure a retriggered output. This is illustrated in Figure 4.
Input
t
MRT
Output
t
= Minimum Time Between the End of the Second Input Pulse and the Beginning of the Retriggered Output
MRT
t
= 15 ns
MRT
Figure 4. Input/Output Requirements
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
1.00E+09
VCC = 5 V
1.00E+08
1.00E+07
1.00E+06
1.00E+05
1.00E+04
1.00E+03
Output Pulse Duration – ns
–
w
t
1.00E+02
1.00E+01
1.00E+00
TA = 25°C
11010210
APPLICATION INFORMATION
RT = 200k Ω
RT = 150k Ω
RT = 80k Ω
RT = 5k Ω
RT = 1k Ω
3
CT – External Timing Capacitance – pF
10
†
RT = 10k Ω
4
10
5
10
6
10
7
Figure 5. Output Pulse Duration vs External Timing Capacitance
14%
12%
10%
–2%
Variation in Output Pulse Duration
–4%
–6%
tw = 866 ns at:
VCC = 5 V
RT = 10 kΩ
CT = 50 pF
TA = 25°C
8%
6%
4%
2%
0%
–60 –40 –20 0 20 40 60 80 100 120 140 160
Temperature – °C
VCC = 2.5 V
VCC = 3 V
VCC = 3.5 V
VCC = 4 V
VCC = 5 V
VCC = 6 V
VCC = 7 V
Figure 6. Variations in Output Pulse Duration vs Temperature
180
†
Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
11
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352E – JULY 1997 – REVISED JANUAR Y 2000
s
µ
Minimum Retrigger Time–
– t
rr
10.00
1.00
0.10
0.01
APPLICATION INFORMATION
MINIMUM TRIGGER TIME
vs
CHARACTERISTICS
V
CC
RT = 1 kΩ
TA = 25°C
CT = 0.01 µF
CT = 1000 pF
CT = 100 pF
0
123456
VCC – Supply Voltage – V
Figure 7
†
OUTPUT PULSE-DURATION CONSTANT
vs
SUPPLY VOLTAGE
1.20
RT = 10 kΩ
TA = 25°C
tW = K × CT × R
1.15
1.10
1.05
1.00
0.95
Output Pulse-Duration Constant – K
0.90
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
T
VCC – Supply Voltage – V
Figure 8
CT = 1000 pF
CT = 0.01 µF
CT = 0.1 µF
F
µ
0.0001
– External Capacitor Value –
T
C
0.00001
EXTERNAL CAPACITANCE
vs
MULTIPLIER FACTOR
0.001
TA = 25°C
VCC = 5 V
1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50
For Capacitor Values of
0.001 µF or Greater,
K = 1.0
(K is Independent of R)
Multiplier Factor – K
Figure 9
DISTRIBUTION OF UNITS
vs
OUTPUT PULSE DURATION
VCC = 5 V
TA = 25°C
CT = 50 pF
RT = 10 k
Relative Frequency of Occurance
99% of Data Units
W
Mean = 856 ns
Median = 856 ns
Std. Dev. = 3.5 ns
–3 Std. Dev. +3 Std. Dev.
Output Pulse Duration (tw)
Median
Figure 10
†
Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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